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Highway speed air resistance is only one part of the equation. If you had a 20 mph headwind when you are going 30 or 40 mph your air resistance is a whole lot more than what you see on your speedometer. Likewise if the wind is at your rear, air resistance is a little less than what you see.
Unfortunately if the wind is from any other direction areo mods become less effective and you will see variations in the theme based on the roads orientation to the wind direction.
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2013 Honda Civic Si - 2.4L
OEM front to back belly pan from the factory.
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